tee: add sec_world_id to struct tee_shm

Adds sec_world_id to struct tee_shm which describes a shared memory
object. sec_world_id can be used by a driver to store an id assigned by
secure world.
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

include/linux/tee_drv.h

@@ -197,7 +197,11 @@ int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
  * @num_pages:	number of locked pages
  * @dmabuf:	dmabuf used to for exporting to user space
  * @flags:	defined by TEE_SHM_* in tee_drv.h
- * @id:		unique id of a shared memory object on this device
+ * @id:		unique id of a shared memory object on this device, shared
+ *		with user space
+ * @sec_world_id:
+ *		secure world assigned id of this shared memory object, not
+ *		used by all drivers
  *
  * This pool is only supposed to be accessed directly from the TEE
  * subsystem and from drivers that implements their own shm pool manager.
@@ -213,6 +217,7 @@ struct tee_shm {
 	struct dma_buf *dmabuf;
 	u32 flags;
 	int id;
+	u64 sec_world_id;
 };
 
 /**